Electric motor.



C. H. J. DILG.

ELECTRIC MOTOR. APPLICATION FILED APR. 30. I910.

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ELECTRH) MOTOR.

APPLICATION FILED APR. 30, 1910.

Patented May 2, 1916. 2 SHEETS-SHEET 2 CHARLES H. J. DILG, OF NEW YORK;N. Y.

ELECTRIC MOTOR.

Specification of Letters Patent.

Patented Application filed April 30, 1910. Serial No. 558,588.

To all whom it may concern:

Be it known that I, CHARLES H. J. Duo,

a citizen of the United States of America,

and a resident of New York, in the county and State of New York, haveinvented a certain new and useful. Electric Motor, of which thefollowing is a specification, the same being a. full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to electrically actuated instruments, and inparticular to a motor equipmentdesigned principally for drilling,tapping and polishing purposes, and provided with a swiveling base andwith means to drive a flexible shaft, whereby the motor is made capableof assuming a number of different desired positions.

With this object in view, the invention consists in certain novelfeatures of construction and combination and arrangement of parts ofsimple construction and efficient in operation.

The accompanying drawings illustrate structures made according to myinvention, in which like letters of reference refer to like partsthroughout the several views, referring to which- I igurel is alongitudinal vertical section of a motor embodying my invention, takenon line 1-1 of Fig. 2; Fig.2 is a vertical sectional elevation of thesame taken on .line 22 of Fig. 1', Fig. 3 is a horizontal section of thesame taken on a plane cutting the axis of thearmature shaft; Fig. r is aview similar to Fig. 3 of, another embodiment of my invention.

Referring particularly by reference charnctel's to the drawings Adenotes the f 'ame or housing of the motor,'which is of an approximatelycubical or box shape, and having the bearing endsor brackets B for thearmature shaft (1 symmetr' all, or of similar contour, the poles p forthe field coils E being undercut on one side, as at (Z, \ijiith thefaces shifted longitudinally,theobject of having tlie said faces Dshifted longitudinally being to permit 'the field coils to be locatedcentrally in the housing, while the armature core F (and pole faces)extend to one, side, whereby the commutator G and ln-ush-holders b arebrought toward the center longitudinally, and within the housing,instead of being placed to one side, as is necessary when the ordinarystraight pole pieces and usual shape of motor frame are used. Anysuitable base H may be employed. forthe motor. In addition to thusobtaining' a symmetrical design, the construction and shape of themotors produce a number of advantages, some of which are as follows,namely, (1 securing larger air space inside of the housing and reducingthe'tendency to heating, (2) larger radiating surface on the outside inthe proportion of a square to a circle of the same diameter, and thusincreasing the cooling a-rea; permitting the field coils to be insertedwithout the ne cessity of bending them, as is the case in circularshaped motors; may be made integral with, or removable from the housing,and if fastened with screws 1), as indicated, can be turned around so asto accommodate the armature core near either end of the motor, or if itbe desired to shift the armature inwardly or outwardly, the pole piecescan also shifted by making the orifices in the housing, through whichthe said screws pass, larger, (5) the bearings, being alike, can beinterchanged, which is a great advantage, inasmuch as sometimesinexpericnoedpersons may have to take a motor apart for some reason orother, and if the bearings are dissimilar, as is the case in theordinary motors, and they should be exchanged, it would naturally resultin throwing the armature core out of line with the pole pieces, thusinterfering with the proper flow of the magnetic flux. I

In addition to the longitudinal ofisetting of the pole faces D, they arealso oifset transversely of the casing. as clearly appears in Figs. 2and 3. This transverse offsetting serves to bring the armature shaftforward toward the operator so that the periphery of a buffing devicewill extend in front of the casing and the casing will consequently notinterfere with the buffing of large pieces.

My invention also contemplates a. construction in which the pole facesare offset only in. the transverse direction and such a construction isillustrated in Fig. 4.

it is obvious that various modifications may be made in theconstructions shown in the drawings and above particularly describedwithin the principle and scope of my invention.

1 claim 1. In an electric motor, in combine? (4;) the pole pieces 7 lottially the transverse ing reversible to bring the center of the.

with the casing, detachable pole pieces having concentric poles withtheir center offset transversely from the longitudinal center of thecasing, the pole-pieces being detachably connected to the casing atopposite points in substantially the transverse central plane and beingreversible to bring the center of the poles alternately toward the frontor rear of the casing.

. 2. In an electric motor, in combination with the casing, detachablepole pieces having concentric poles off-set longitudinally from thetransverse center of the casing and having their center off-settransversely from the longitudinal center of the casing, the pole piecesbeing detachably connected to the casing at opposite points insubstancentral plane and bepoles alternately toward the front or rehr ofthe casing.

3; In an electric motor in combination with the casing, two oppositelydi osed field coils having a common axis, an two opposing polar member'scarried by the casing, each polar member being surrounded by one of thefield coils and the polar members having their pole faces offset in theplaced from the same direction transversel of the casing, whereby thepole faces are disposed in cooperative relation with their centertransversely displaced from the axis of the field coils.

4t. In an electric motor in combination with the casing, two oppositelydisposed field coils having a common axis, and two opposing polarmembers carried by the casing, each polar member being surrounded by oneof the field coils and the polar members having their pole facessimilarly offset transversely and axially of the casin whereby the polefaces are concentrical y disposed in cooperative relation with theircentral transverse plane longitudinally disaxis of the field coils andwith their axis at one side of the, axis of ,the field coils.

In testimony ofthe foregoing specification, I do hereby sign the same inthe city of New York, count York, this first day 0 September, 1909.

' CHARLES H. J. DILG. Witnesses: 1

' RoBT. Sonwanz,

J; ODELL FOWLER.

concentrically and State of New

